Bump is-svg and postcss-svgo

Removes [is-svg](https://github.com/sindresorhus/is-svg). It's no longer used after updating ancestor dependency [postcss-svgo](https://github.com/cssnano/cssnano). These dependencies need to be updated together.


Removes `is-svg`

Updates `postcss-svgo` from 4.0.2 to 4.0.3
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/4.0.2...4.0.3)

---
updated-dependencies:
- dependency-name: is-svg
  dependency-type: indirect
- dependency-name: postcss-svgo
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -6575,12 +6575,6 @@
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       "dev": true
     },
-    "node_modules/html-comment-regex": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/html-comment-regex/-/html-comment-regex-1.1.2.tgz",
-      "integrity": "sha512-P+M65QY2JQ5Y0G9KKdlDpo0zK+/OHptU5AaBwUfAIDJZk1MYf32Frm84EcOytfJE0t5JvkAnKlmjsXDnWzCJmQ==",
-      "dev": true
-    },
     "node_modules/html-encoding-sniffer": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-1.0.2.tgz",
@@ -7377,18 +7371,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/is-svg": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/is-svg/-/is-svg-3.0.0.tgz",
-      "integrity": "sha512-gi4iHK53LR2ujhLVVj+37Ykh9GLqYHX6JOVXbLAucaG/Cqw9xwdFOjDM2qeifLs1sF1npXXFvDu0r5HNgCMrzQ==",
-      "dev": true,
-      "dependencies": {
-        "html-comment-regex": "^1.1.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/is-symbol": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.3.tgz",
@@ -9831,12 +9813,11 @@
       }
     },
     "node_modules/postcss-svgo": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/postcss-svgo/-/postcss-svgo-4.0.2.tgz",
-      "integrity": "sha512-C6wyjo3VwFm0QgBy+Fu7gCYOkCmgmClghO+pjcxvrcBKtiKt0uCF+hvbMO1fyv5BMImRK90SMb+dwUnfbGd+jw==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/postcss-svgo/-/postcss-svgo-4.0.3.tgz",
+      "integrity": "sha512-NoRbrcMWTtUghzuKSoIm6XV+sJdvZ7GZSc3wdBN0W19FTtp2ko8NqLsgoh/m9CzNhU3KLPvQmjIwtaNFkaFTvw==",
       "dev": true,
       "dependencies": {
-        "is-svg": "^3.0.0",
         "postcss": "^7.0.0",
         "postcss-value-parser": "^3.0.0",
         "svgo": "^1.0.0"
@@ -18210,12 +18191,6 @@
       "integrity": "sha1-wc56MWjIxmFAM6S194d/OyJfnDg=",
       "dev": true
     },
-    "html-comment-regex": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/html-comment-regex/-/html-comment-regex-1.1.2.tgz",
-      "integrity": "sha512-P+M65QY2JQ5Y0G9KKdlDpo0zK+/OHptU5AaBwUfAIDJZk1MYf32Frm84EcOytfJE0t5JvkAnKlmjsXDnWzCJmQ==",
-      "dev": true
-    },
     "html-encoding-sniffer": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-1.0.2.tgz",
@@ -18855,15 +18830,6 @@
       "integrity": "sha512-buY6VNRjhQMiF1qWDouloZlQbRhDPCebwxSjxMjxgemYT46YMd2NR0/H+fBhEfWX4A/w9TBJ+ol+okqJKFE6vQ==",
       "dev": true
     },
-    "is-svg": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/is-svg/-/is-svg-3.0.0.tgz",
-      "integrity": "sha512-gi4iHK53LR2ujhLVVj+37Ykh9GLqYHX6JOVXbLAucaG/Cqw9xwdFOjDM2qeifLs1sF1npXXFvDu0r5HNgCMrzQ==",
-      "dev": true,
-      "requires": {
-        "html-comment-regex": "^1.1.0"
-      }
-    },
     "is-symbol": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.3.tgz",
@@ -20880,12 +20846,11 @@
       }
     },
     "postcss-svgo": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/postcss-svgo/-/postcss-svgo-4.0.2.tgz",
-      "integrity": "sha512-C6wyjo3VwFm0QgBy+Fu7gCYOkCmgmClghO+pjcxvrcBKtiKt0uCF+hvbMO1fyv5BMImRK90SMb+dwUnfbGd+jw==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/postcss-svgo/-/postcss-svgo-4.0.3.tgz",
+      "integrity": "sha512-NoRbrcMWTtUghzuKSoIm6XV+sJdvZ7GZSc3wdBN0W19FTtp2ko8NqLsgoh/m9CzNhU3KLPvQmjIwtaNFkaFTvw==",
       "dev": true,
       "requires": {
-        "is-svg": "^3.0.0",
         "postcss": "^7.0.0",
         "postcss-value-parser": "^3.0.0",
         "svgo": "^1.0.0"